课堂教学是素质教育的主渠道。提高课堂教学效益，就必须优化课堂教学，而优化课堂教学环节是关键，因为，素质教育就从这里开始。当今课堂教学存在的主要问题表现在两个方面：一是没有中心环节。造成这种情形的原因是多方面的。重要一点是在突出教学重点的设计中忽略了台阶练 Classroom teaching is the main channel of quality education. To improve the efficiency of classroom teaching, we must optimize the classroom teaching, and optimizing the classroom teaching is the key, because quality education starts from here. The main problems in today’s classroom teaching are manifested in two aspects: First, there is no central aspect. The reasons for this situation are manifold. The important point is to ignore the step training in the design of teaching emphasis